Pane Observing Site
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pane Observing Site clear sky chart from 2005-11-06 to 2024-03-23.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.
Observation TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(no limit)Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
34%
23615
14%
80773
10%
23513
40%
23513
16%
57969

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 10thNight
13%
754
9%
4089
4%
737
21%
737
5%
3243
January11th to 20thNight
14%
759
6%
4093
3%
740
19%
740
4%
3370
January21st to endNight
16%
831
5%
4515
4%
814
22%
814
5%
3804
February1st to 10thNight
20%
760
12%
2470
7%
760
28%
760
11%
1919
February11th to 20thNight
14%
742
10%
2405
5%
740
21%
740
11%
1838
February21st to endNight
17%
628
12%
1879
5%
628
24%
628
12%
1469
March1st to 10thNight
21%
760
16%
2090
8%
760
29%
760
18%
1525
March11th to 20thNight
25%
760
19%
2090
10%
760
33%
760
19%
1500
March21st to endNight
25%
801
17%
2201
8%
801
33%
801
19%
1605
April1st to 10thNight
26%
720
14%
1886
6%
720
30%
720
20%
1367
April11th to 20thNight
31%
689
17%
1753
7%
689
36%
689
24%
1241
April21st to endNight
29%
540
19%
1620
7%
540
37%
540
22%
1098
May1st to 10thNight
37%
540
14%
1620
8%
540
42%
540
19%
1136
May11th to 20thNight
40%
531
16%
1593
10%
531
46%
531
21%
1113
May21st to endNight
56%
436
18%
1599
15%
436
63%
436
26%
942
June1st to 10thNight
51%
360
16%
1440
17%
360
58%
360
24%
841
June11th to 20thNight
52%
360
16%
1440
19%
360
57%
360
21%
873
June21st to endNight
55%
360
18%
1440
21%
360
62%
360
24%
850
July1st to 10thNight
61%
413
14%
1463
15%
413
65%
413
25%
903
July11th to 20thNight
61%
522
17%
1566
15%
522
64%
522
33%
945
July21st to endNight
61%
591
15%
1672
13%
558
63%
558
27%
1087
August1st to 10thNight
64%
537
18%
1600
14%
534
66%
534
31%
991
August11th to 20thNight
61%
534
20%
1598
16%
534
63%
534
29%
1012
August21st to endNight
57%
688
20%
1876
13%
688
60%
688
32%
1210
September1st to 10thNight
57%
720
23%
1800
14%
720
61%
720
35%
1163
September11th to 20thNight
63%
720
26%
1975
19%
720
67%
720
37%
1188
September21st to endNight
44%
720
22%
1980
15%
720
49%
720
27%
1316
October1st to 10thNight
46%
720
18%
2159
16%
720
51%
720
26%
1390
October11th to 20thNight
32%
720
17%
2160
11%
720
41%
720
21%
1474
October21st to endNight
30%
792
18%
2376
12%
792
38%
792
18%
1696
November1st to 10thNight
40%
740
21%
2301
17%
740
47%
740
25%
1466
November11th to 20thNight
27%
760
17%
2593
12%
760
36%
760
16%
1804
November21st to endNight
24%
760
14%
2660
9%
760
32%
760
14%
1933
December1st to 10thNight
18%
760
8%
2660
5%
760
23%
760
9%
2118
December11th to 20thNight
18%
759
9%
3251
6%
759
24%
759
8%
2496
December21st to endNight
16%
828
5%
4860
5%
817
22%
817
5%
4043

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

Occurrence of each ForecastData
Points
Cloud CoverDay
17%10%47%6%35%5%5%7%30%
78770
Night
18%11%47%6%3445%6%32%
81098
TransparencyDay
53%7%12%18%10%1
78489
Night
52%6%11%18%10%2
80898
SeeingDay
22%14%27%21%12%4
13790
Night
21%12%27%27%12%1
23639

By Month

Percentage Cloud Cover SE (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
20%19%10%10%6%34335%18%
2818
11th to 20thDay
14%23%9%12%9%3333318%
2840
21st to endDay
26%19%8%12%8%3333411%
3124
February1st to 10thDay
21%15%6%10%8%44335%22%
1710
11th to 20thDay
17%12%8%11%7%4445%6%22%
1663
21st to endDay
20%14%5%9%7%24446%25%
1570
March1st to 10thDay
18%10%5%8%7%34346%31%
2090
11th to 20thDay
17%12%48%6%4445%6%30%
2090
21st to endDay
22%10%48%6%245%5%7%27%
2200
April1st to 10thDay
15%11%5%7%5%445%5%7%31%
2073
11th to 20thDay
19%10%37%6%35%5%5%6%33%
2172
21st to endDay
23%8%36%5%345%46%32%
2340
May1st to 10thDay
19%8%37%6%45%5%5%8%28%
2340
11th to 20thDay
20%7%37%7%46%46%8%29%
2301
21st to endDay
12%425%6%46%6%7%10%38%
2673
June1st to 10thDay
15%6%36%6%46%6%6%9%34%
2520
11th to 20thDay
14%6%36%6%36%5%5%10%35%
2520
21st to endDay
14%6%36%6%35%5%6%9%38%
2520
July1st to 10thDay
11%6%36%6%35%5%6%8%40%
2449
11th to 20thDay
11%7%36%6%45%6%6%11%36%
2340
21st to endDay
12%6%36%7%47%6%7%9%35%
2547
August1st to 10thDay
9%5%36%8%47%7%8%9%34%
2327
11th to 20thDay
13%6%26%7%46%6%7%9%33%
2303
21st to endDay
12%5%26%6%46%6%6%9%38%
2461
September1st to 10thDay
16%6%35%425%45%8%42%
2160
11th to 20thDay
12%6%35%445%5%5%9%43%
1981
21st to endDay
18%7%37%6%35%447%37%
1980
October1st to 10thDay
15%6%36%5%35%5%6%8%38%
1800
11th to 20thDay
20%8%37%6%45%5%5%5%33%
1800
21st to endDay
24%10%36%5%34447%30%
1980
November1st to 10thDay
12%8%36%5%35%5%46%41%
1772
11th to 20thDay
18%13%5%6%5%3445%6%32%
1584
21st to endDay
17%14%6%9%6%45%5%46%26%
1520
December1st to 10thDay
22%17%8%10%6%245%35%18%
1520
11th to 20thDay
20%16%7%11%5%34446%20%
1910
21st to endDay
26%22%7%9%5%3434413%
2772
January1st to 10thNight
17%20%9%11%6%4443418%
4109
11th to 20thNight
17%18%7%13%7%5%5%44416%
4120
21st to endNight
29%14%8%9%9%3333316%
4532
February1st to 10thNight
22%12%5%9%7%35%445%25%
2470
11th to 20thNight
19%12%5%10%6%35%445%25%
2403
21st to endNight
21%12%5%10%6%35%5%45%25%
1879
March1st to 10thNight
20%10%46%5%3446%5%33%
2090
11th to 20thNight
20%11%37%433446%35%
2090
21st to endNight
18%11%47%5%33445%34%
2201
April1st to 10thNight
18%10%46%6%34447%35%
1886
11th to 20thNight
17%7%36%6%345%5%7%37%
1753
21st to endNight
16%9%35%6%245%6%8%36%
1620
May1st to 10thNight
17%8%46%5%45%5%5%8%32%
1620
11th to 20thNight
17%8%36%5%35%45%9%36%
1592
21st to endNight
10%5%245%35%5%7%10%44%
1598
June1st to 10thNight
10%6%35%5%345%6%9%44%
1440
11th to 20thNight
12%5%45%5%45%5%6%9%41%
1440
21st to endNight
10%325%5%46%5%6%8%45%
1440
July1st to 10thNight
8%426%6%45%6%7%8%44%
1506
11th to 20thNight
9%425%5%35%5%6%10%45%
1620
21st to endNight
10%6%35%6%35%6%7%9%40%
1771
August1st to 10thNight
7%5%26%5%45%5%8%10%44%
1611
11th to 20thNight
10%6%346%35%46%8%44%
1598
21st to endNight
11%5%25%4346%6%9%44%
1876
September1st to 10thNight
13%5%14425%5%5%7%48%
1800
11th to 20thNight
11%424425%45%9%51%
1975
21st to endNight
15%7%35%4345%5%7%42%
1980
October1st to 10thNight
15%6%25%5%34447%45%
2159
11th to 20thNight
19%8%25%6%345%46%38%
2160
21st to endNight
25%8%35%434446%34%
2376
November1st to 10thNight
14%7%35%5%3445%7%44%
2301
11th to 20thNight
19%11%36%5%35%45%6%33%
2593
21st to endNight
20%13%5%7%6%3445%6%30%
2660
December1st to 10thNight
23%15%8%8%6%34345%20%
2660
11th to 20thNight
19%17%7%9%5%34435%23%
3285
21st to endNight
26%18%6%9%7%34445%14%
4884

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
69%6%10%12%4
2819
11th to 20thDay
72%38%12%31
2840
21st to endDay
77%6%8%7%2
3124
February1st to 10thDay
67%48%14%7%1
1710
11th to 20thDay
64%5%10%14%7%
1672
21st to endDay
61%5%11%15%7%1
1570
March1st to 10thDay
54%6%11%21%7%
2090
11th to 20thDay
55%5%11%18%9%2
2090
21st to endDay
56%6%9%16%10%1
2200
April1st to 10thDay
51%6%11%19%11%2
2073
11th to 20thDay
51%6%10%16%14%2
2172
21st to endDay
52%6%10%21%10%2
2340
May1st to 10thDay
53%7%12%18%9%1
2340
11th to 20thDay
53%8%12%15%10%2
2305
21st to endDay
39%9%18%23%9%2
2673
June1st to 10thDay
45%9%13%21%11%1
2520
11th to 20thDay
44%8%14%21%12%1
2520
21st to endDay
41%8%12%25%12%1
2520
July1st to 10thDay
41%9%13%20%13%3
2382
11th to 20thDay
41%8%14%23%14%1
2271
21st to endDay
43%9%14%21%13%1
2405
August1st to 10thDay
40%10%16%25%8%
2314
11th to 20thDay
43%8%16%22%9%1
2303
21st to endDay
40%10%13%22%13%3
2461
September1st to 10thDay
40%7%11%21%17%3
2160
11th to 20thDay
37%7%14%27%14%1
1981
21st to endDay
47%6%11%22%14%
1980
October1st to 10thDay
41%7%14%21%16%1
1800
11th to 20thDay
51%6%11%22%10%
1800
21st to endDay
54%5%13%17%10%1
1980
November1st to 10thDay
43%6%11%22%16%2
1772
11th to 20thDay
53%412%18%10%2
1584
21st to endDay
60%5%11%16%7%1
1520
December1st to 10thDay
70%410%12%3
1520
11th to 20thDay
66%5%10%16%3
1906
21st to endDay
74%5%10%8%2
2772
January1st to 10thNight
68%5%10%13%3
4109
11th to 20thNight
71%6%10%10%2
4120
21st to endNight
74%47%12%3
4532
February1st to 10thNight
62%5%9%17%6%
2470
11th to 20thNight
61%5%10%16%7%
2405
21st to endNight
61%6%8%14%9%1
1879
March1st to 10thNight
52%5%11%20%11%1
2090
11th to 20thNight
50%5%12%22%9%2
2090
21st to endNight
52%5%8%18%14%3
2201
April1st to 10thNight
51%5%9%19%14%2
1886
11th to 20thNight
46%6%12%17%16%3
1753
21st to endNight
45%7%11%23%12%3
1620
May1st to 10thNight
49%7%10%19%12%3
1620
11th to 20thNight
46%8%11%17%15%3
1593
21st to endNight
34%9%15%26%14%2
1599
June1st to 10thNight
36%8%14%24%16%2
1440
11th to 20thNight
39%9%14%22%15%2
1440
21st to endNight
35%9%13%24%17%2
1440
July1st to 10thNight
36%10%12%21%18%4
1463
11th to 20thNight
31%9%16%24%19%2
1566
21st to endNight
38%10%15%21%14%3
1672
August1st to 10thNight
33%9%16%26%16%1
1600
11th to 20thNight
35%9%14%25%14%2
1598
21st to endNight
34%10%13%24%15%4
1876
September1st to 10thNight
34%8%12%23%19%5%
1800
11th to 20thNight
29%8%14%26%22%1
1975
21st to endNight
41%6%12%22%18%1
1980
October1st to 10thNight
39%7%13%23%15%3
2159
11th to 20thNight
46%6%11%23%13%1
2160
21st to endNight
51%5%10%20%12%2
2376
November1st to 10thNight
41%6%12%22%16%4
2301
11th to 20thNight
52%5%11%20%10%2
2593
21st to endNight
56%5%11%21%6%1
2660
December1st to 10thNight
66%5%11%13%4
2660
11th to 20thNight
64%5%12%16%3
3288
21st to endNight
72%6%11%9%2
4884

Seeing (when cloud cover <= 80%)
Color Meanings:
Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
29%29%25%13%31
267
11th to 20thDay
33%26%30%9%1
270
21st to endDay
27%30%29%10%31
297
February1st to 10thDay
33%19%37%10%1
270
11th to 20thDay
34%28%30%7%1
270
21st to endDay
37%23%30%9%
249
March1st to 10thDay
29%21%29%18%3
460
11th to 20thDay
32%19%30%13%41
460
21st to endDay
30%21%27%17%5%1
470
April1st to 10thDay
28%20%27%16%8%1
420
11th to 20thDay
23%19%27%18%9%4
412
21st to endDay
29%16%30%16%6%2
420
May1st to 10thDay
27%18%26%18%7%3
423
11th to 20thDay
22%14%31%20%10%3
447
21st to endDay
15%7%27%27%19%6%
485
June1st to 10thDay
14%10%31%27%14%4
450
11th to 20thDay
18%13%23%26%16%4
450
21st to endDay
14%9%32%29%13%3
450
July1st to 10thDay
12%7%19%29%23%10%
445
11th to 20thDay
13%6%26%26%21%8%
444
21st to endDay
13%6%25%28%19%8%
488
August1st to 10thDay
9%5%23%31%21%10%
446
11th to 20thDay
15%5%22%29%18%11%
439
21st to endDay
12%5%23%27%21%11%
495
September1st to 10thDay
16%8%21%28%19%8%
450
11th to 20thDay
11%6%19%30%22%11%
450
21st to endDay
20%12%24%24%15%5%
450
October1st to 10thDay
17%8%28%24%19%4
450
11th to 20thDay
24%16%29%22%8%1
450
21st to endDay
31%15%30%18%6%
495
November1st to 10thDay
19%19%31%17%12%2
370
11th to 20thDay
31%18%29%15%6%1
210
21st to endDay
26%21%41%11%2
180
December1st to 10thDay
31%27%27%10%42
180
11th to 20thDay
32%20%33%13%2
180
21st to endDay
35%20%29%13%3
198
January1st to 10thNight
28%22%32%16%3
760
11th to 20thNight
32%17%31%18%3
760
21st to endNight
26%19%31%20%4
836
February1st to 10thNight
28%16%29%25%3
760
11th to 20thNight
30%18%34%17%1
743
21st to endNight
29%16%33%19%3
628
March1st to 10thNight
25%17%31%23%3
760
11th to 20thNight
25%19%28%22%5%1
760
21st to endNight
23%15%31%24%5%1
801
April1st to 10thNight
23%15%30%25%6%
720
11th to 20thNight
21%13%32%23%10%1
689
21st to endNight
19%10%35%29%6%
540
May1st to 10thNight
20%10%26%33%9%1
540
11th to 20thNight
20%7%29%31%12%1
531
21st to endNight
13%223%36%23%3
438
June1st to 10thNight
10%327%40%19%1
360
11th to 20thNight
13%424%39%19%1
360
21st to endNight
9%328%38%21%1
360
July1st to 10thNight
8%120%41%23%6%
413
11th to 20thNight
8%320%35%29%5%
522
21st to endNight
12%315%41%27%2
591
August1st to 10thNight
10%116%42%28%3
537
11th to 20thNight
10%415%37%30%4
534
21st to endNight
12%322%33%25%6%
688
September1st to 10thNight
15%318%33%27%4
720
11th to 20thNight
11%417%34%31%3
720
21st to endNight
18%8%24%26%20%4
720
October1st to 10thNight
18%7%23%28%22%2
720
11th to 20thNight
23%11%29%26%10%1
720
21st to endNight
28%13%25%26%7%
792
November1st to 10thNight
18%10%27%32%13%
740
11th to 20thNight
26%15%27%23%7%1
760
21st to endNight
27%15%29%23%6%
760
December1st to 10thNight
32%17%27%19%4
760
11th to 20thNight
27%19%30%21%3
760
21st to endNight
29%16%33%22%1
836
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